title: Photoastigmatic refractive keratectomy for primary treatment and revision of myopic astigmatism.
abstract: OBJECTIVE
  To evaluate the results in 43 eyes treated with a rotating mask for myopic astigmatism and followed for up to 1 year.
  
  
  METHODS
  Lucerne Eye Clinic, Cantonal Hospital, Lucerne, Switzerland.
  
  
  METHODS
  Thirty-two patients (42 eyes) were selected to have photoastigmatic refractive keratectomy (PARK). In 33% (14 eyes), this treatment was the second or third ablation. The Aesculap Meditec MEL 60 excimer laser was operated in toe scanning slit mode, and a rotating mask was used. To evaluate cylindrical shaping, vector analysis was performed.
  
  
  RESULTS
  One year after PARK, mean uncorrected visual acuity in all patients (26 eyes) improved from 20/160 preoperatively to 20/40. Surgically induced astigmatism in 20 of 26 eyes (77%) was within +/- 1.00 diopter (D) of the targeted induced astigmatism. At 1 year, 81% of patients who had primary excimer laser treatment for myopic astigmatism equivalent to -10.00 D or less were within +/- 1.00 D of target refraction compared with 44% of re-treated eyes.
  
  
  CONCLUSIONS
  The result of PARK in eyes with low to moderate degrees of myopic astigmatism was satisfactory. However, in eyes with extensive scarring and wound healing activity after the first ablation, re-treatment was less predictable.
authors.affiliation: Lucerne Eye Clinic, Cantonal Hospital, Switzerland.
authors.forename: I
authors.initials: I
authors.lastname: Schipper
authors.forename: P
authors.initials: P
authors.lastname: Senn
authors.forename: L
authors.initials: L
authors.lastname: Wienecke
authors.forename: K D
authors.initials: KD
authors.lastname: Oyo-Szerenyi
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D003315:Cornea / Q000503:physiopathology / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D054018:Lasers, Excimer; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods; D012029:Refraction, Ocular; D012086:Reoperation; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology